<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>

</head>

<body>
    <div id="todo-list-example">
        <form v-on:submit.prevent="addNewTodo">
            <label for="new-todo">Add a todo</label>
            <input v-model="newTodoText" id="new-todo" placeholder="E.g. Feed the cat">
            <button>Add</button>
        </form>
        <ul>
            <li is="todo-item" v-for="(todo, index) in todos" v-bind:key="todo.id" v-bind:title="todo.title"
                v-on:remove="todos.splice(index, 1)"></li>
        </ul>


        <script>
            
            Vue.component('todo-item', {
                template: '\
                    <li>\
                    {{ title }}\
                    <button v-on:click="$emit(\'remove\')">Remove</button>\
                    </li>\
                ',
                props: ['title']
            })

            new Vue({
                el: '#todo-list-example',
                data: {
                    newTodoText: '',
                    todos: [
                        {
                            id: 1,
                            title: 'Do the dishes',
                        },
                        {
                            id: 2,
                            title: 'Take out the trash',
                        },
                        {
                            id: 3,
                            title: 'Mow the lawn'
                        }
                    ],
                    nextTodoId: 4
                },
                methods: {
                    addNewTodo: function () {
                        this.todos.push({
                            id: this.nextTodoId++,
                            title: this.newTodoText
                        })
                        this.newTodoText = ''
                    }
                }
            })
        </script>
</body>

</html>